Total ankle arthroplasty (TAA) has become a favourable treatment for ankle osteoarthritis (OA). This surgical procedure allows for the preservation of ankle mobility and function, while also reducing the progression of adjacent joint degeneration. Although TAA may show improvements in short- and mid-term clinical outcomes, at the 10-year survivorship, there is a high failure rate associated with aseptic loosening of at least one component (26% to 68%), which is significantly higher than hip and knee arthroplasty. Currently, the newer generation of TAA implants rely on primary and secondary fixation, in which primary fixation is obtained through mechanical fixation immediately post-operative and secondary fixation is achieved through bone ingrowth at the bone-implant interface. To promote bone ingrowth, low micromotion between the bone and implant of 20 µm to 50 µm is required. Due to the lack of standard micromotion tests for TAA tibial components, the current study aimed to develop a mechanical test to measure the maximum micromotion at the bone surrogate-implant interface for TAA tibial components. The proposed mechanical test was able to measure micromotion with linear variable differential transformers (LVDTs) and calculate the maximum micromotion. A statistically significant difference in maximum micromotion was detected when tested with two low density PU foams (10 PCF and 15 PCF). Although, the maximum micromotion (>150 μm) observed was larger than other published studies, the proposed mechanical test can be further improved including implementing finite element analysis or digital image correlation. This thesis gives insights on the importance of a patient’s bone density and how that may dictate the successful fixation of TAA tibial components. By providing testing methods and quantifying micromotion of TAA tibial components with different clinical experiences, orthopaedic surgeons and implant manufacturers will gain insights into operative techniques and implant choices to improve long-term clinical outcomes for TAA